73318621 has 2 divisors, whose sum is σ = 73318622. Its totient is φ = 73318620.

The previous prime is 73318589. The next prime is 73318633. The reversal of 73318621 is 12681337.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70476025 + 2842596 = 8395^2 + 1686^2 .

It is a cyclic number.

It is not a de Polignac number, because 73318621 - 2⁵ = 73318589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73318691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36659310 + 36659311.

It is an arithmetic number, because the mean of its divisors is an integer number (36659311).

Almost surely, 2^73318621 is an apocalyptic number.

It is an amenable number.

73318621 is a deficient number, since it is larger than the sum of its proper divisors (1).

73318621 is an equidigital number, since it uses as much as digits as its factorization.

73318621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 31.

The square root of 73318621 is about 8562.6293274905. The cubic root of 73318621 is about 418.5410851858.

Adding to 73318621 its reverse (12681337), we get a palindrome (85999958).

The spelling of 73318621 in words is "seventy-three million, three hundred eighteen thousand, six hundred twenty-one".